A sign in front of the large well-preserved wall one can see from the agora indicates it is "The bouleuterium odeum", however, the same sign in Turkish calls it a "Kapalı toplantı yeri": a closed meeting place. Behind the hall is an open space, are some stairs, it's rather well preserved, but I could not conclude if this was a space for performances (an odeon) or "political" meeting (bouleuterion). To keep the name of this sub-gallery short I went for the first.